	  public static void main(String[] args) {
	        Scanner sc= new Scanner(System.in);
	        System.out.println("JAVA考试成绩");
	        double score=sc.nextDouble();
	           if(score>=80){
	               System.out.println("A");
	           }else if (score >= 70 && score < 80){ 
	               System.out.println("B");
	           }else if(score >= 60 && score < 70){
	               System.out.println("C");
	           }else if(score <60){
	               System.out.println("D");
	       }
	       
	       }